The interesting thing about it is that I have used almost only replicators for that - all the buildings are constructed in 3D using about 14 modules, which were then replicated using point clouds with particle transform maps. It allowed for VERY easy and fast changes, while architects were working on building design.

I'm not to happy with the trees, but for the next project will do better ones ;) Grass is photoshopped - I was working on C2D laptop on this, while my main machine was in service.